let str = "hello,imooc"
console.log(str.substring(6))
let date = new Date(2019, 5, 1)
console.log(date.getFullYear())
console.log(date.getMonth())
console.log("最小值:" + Math.min(20, 41, 15, 8))
console.log("最大值:" + Math.max(20, 41, 15, 8))